Source : Webster's Revised Unabridged Dictionary (1913)

Toboggan \To*bog"gan\, v. i. [imp. & p. p. {Tobogganed}; p. pr.
   & vb. n. {Tobogganing}.]
   To slide down hill over the snow or ice on a toboggan.
   --Barilett.

Source : WordNet®

tobogganing
     n : riding on a long light sled with low handrails